Why a flower is called a modified shoot? What changes occur when a shoot apex produces flower?

Explanation

### Step-by-Step Solution:

1. **Definition of Flower as a Modified Shoot**:
- A flower is referred to as a modified shoot because it originates from the shoot apex of a plant. The structure of a flower resembles that of a shoot, but it has undergone specific modifications to facilitate reproduction.

2. **Changes in the Thalamus**:
- The thalamus, or receptacle, of the flower becomes enlarged. This enlargement is a significant change that distinguishes flowers from typical shoots.

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